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LeftJoinExtensionLeftJoinTFirst, TSecond, TKey, TResult Method (IEnumerableTFirst, IEnumerableTSecond, FuncTFirst, TKey, FuncTSecond, TKey, FuncTFirst, TResult, FuncTFirst, TSecond, TResult)

Performs a left outer join on two heterogeneous sequences. Additional arguments specify key selection functions and result projection functions.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<TResult> LeftJoin<TFirst, TSecond, TKey, TResult>(
	this IEnumerable<TFirst> first,
	IEnumerable<TSecond> second,
	Func<TFirst, TKey> firstKeySelector,
	Func<TSecond, TKey> secondKeySelector,
	Func<TFirst, TResult> firstSelector,
	Func<TFirst, TSecond, TResult> bothSelector
)

<ExtensionAttribute>
Public Shared Function LeftJoin(Of TFirst, TSecond, TKey, TResult) ( 
	first As IEnumerable(Of TFirst),
	second As IEnumerable(Of TSecond),
	firstKeySelector As Func(Of TFirst, TKey),
	secondKeySelector As Func(Of TSecond, TKey),
	firstSelector As Func(Of TFirst, TResult),
	bothSelector As Func(Of TFirst, TSecond, TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TFirst, typename TSecond, typename TKey, typename TResult>
static IEnumerable<TResult>^ LeftJoin(
	IEnumerable<TFirst>^ first, 
	IEnumerable<TSecond>^ second, 
	Func<TFirst, TKey>^ firstKeySelector, 
	Func<TSecond, TKey>^ secondKeySelector, 
	Func<TFirst, TResult>^ firstSelector, 
	Func<TFirst, TSecond, TResult>^ bothSelector
)

[<ExtensionAttribute>]
static member LeftJoin : 
        first : IEnumerable<'TFirst> * 
        second : IEnumerable<'TSecond> * 
        firstKeySelector : Func<'TFirst, 'TKey> * 
        secondKeySelector : Func<'TSecond, 'TKey> * 
        firstSelector : Func<'TFirst, 'TResult> * 
        bothSelector : Func<'TFirst, 'TSecond, 'TResult> -> IEnumerable<'TResult> 

first

Type: System.Collections.GenericIEnumerableTFirst
The first sequence of the join operation.

second

Type: System.Collections.GenericIEnumerableTSecond
The second sequence of the join operation.

firstKeySelector

Type: SystemFuncTFirst, TKey
Function that projects the key given an element from first.

secondKeySelector

Type: SystemFuncTSecond, TKey
Function that projects the key given an element from second.

firstSelector

Type: SystemFuncTFirst, TResult
Function that projects the result given just an element from first where there is no corresponding element in second.

bothSelector

Type: SystemFuncTFirst, TSecond, TResult
Function that projects the result given an element from first and an element from second that match on a common key.

TFirst

The type of elements in the first sequence.

TSecond

The type of elements in the second sequence.

TKey

The type of the key returned by the key selector functions.

TResult

The type of the result elements.

Type:

A sequence containing results projected from a left outer join of the two input sequences.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

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